S1 Corporation Consolidates Divisional Names to Form Single S1 Brand

NORCROSS, Ga., Nov. 2, 2009 (GLOBE NEWSWIRE) -- S1 CORPORATION (Nasdaq:SONE), a
leading global provider of financial services and payments software solutions
today announced a change in its corporate branding.

"For the last three years, we have offered our solutions under three brands:
Postilion, S1 Enterprise and FSB Solutions. Effective immediately, we will use a
single brand -- S1 -- under which we will market all of our solutions," said
Johann Dreyer, Chief Executive Officer, S1 Corporation.

"This change is in response to input from key stakeholders, including customers,
prospects, partners, industry analysts and investors. A single brand provides
more clarity on the family of solutions our entire organization has to offer and
how they can benefit banks, credit unions, retailers, and processors around the
world."

S1 has consolidated the websites supporting the three brands into a single
website (www.s1.com). The Company has adopted a single logo and established a
supporting corporate identity for its single brand.

About S1 Corporation

Leading banks, credit unions, retailers, and processors need technology that
adapts to the complex and challenging needs of their businesses. These
organizations want solutions that can respond quickly to changes in the
marketplace and help grow their businesses. For more than 20 years, S1
Corporation (Nasdaq:SONE) has been a leader in developing software products that
offer flexibility and reliability. Over 3,000 organizations worldwide depend on
S1 for payments, online banking, mobile banking, voice banking, branch banking
and lending solutions that deliver a competitive advantage.

Forward-Looking Statements

This press release contains forward-looking statements within the safe harbor
provisions of the Private Securities Litigation Reform Act. These statements
include statements with respect to our financial condition, results of
operations and business. The words "believes," "expects," "may," "will,"
"should," "projects," "contemplates," "anticipates," "forecasts," "intends" or
similar terminology identify forward-looking statements. These statements are
based on our beliefs as well as assumptions made using information currently
available to us. Because these statements reflect our current views concerning
future events, they involve risks, uncertainties and assumptions. Therefore,
actual results may differ significantly from the results discussed in the
forward-looking statements. The risk factors included in our reports filed with
the Securities and Exchange Commission (and available on our web site at
www.s1.com or the SEC's web site at www.sec.gov) provide examples of risks,
uncertainties and events that may cause our actual results to differ materially
from the expectations we describe in our forward-looking statements. Except as
provided by law, we undertake no obligation to update any forward-looking
statement.

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CONTACT: S1 Corporation
David Fontaine
404.923.6865
David.Fontaine@S1.com